| Manufacturer | Seiko |
| Caliber Number | 7B62 |
| Movement Type | Solar-powered, radio-controlled, quartz |
| Display | Analog |
| Jewel Count | 0 |
| Frequency | 32,768 Hz |
| Capacitor Part # | 3023 24M, 302324M (unconfirmed!) |
| Power Reserve | ~9 months on a full charge |
| Integrated Circuit | 2 piece IC – Oscillator, frequency divider, drive/reception circuit |
| Driving System | Step motor |
| Hand Count | 3 |
| Functions | Central hours; central minutes; central seconds; date at 3:00 |
| Other Features | Radio signal reception for automatic time setting |
| Hacking Seconds? | Yes |
| Country of Manufacture | Made in Japan |
| Known Models | Seiko Selection Solar Radio (Ref: SBTM335) (Add your watch to the comments below…) |
Seiko caliber 7B62 is a radio-controlled quartz movement that runs on a rechargeable battery (aka capacitor) connected to a solar sensor under the dial which collects and stores energy from light. Timepieces with this movement were introduced in 2019~2020 for the Japan domestic market (JDM).
Radio-Controlled Timekeeping:
The radio-controlled features means that watches with this calibre are able to connect to radio towers (Cesium Atomic Clock) in order to receive data about the current time. The watch then uses that information to automatically set the time accordingly.
In Seiko’s own words:
“This watch sets the time and date by automatically receiving a radio signal at a fixed time. It automatically receives a radio signal before 2:00 AM, 3:00 AM and 4:00 AM.” -Seiko 7B72 user manual, page 17
Similar Calibers:
There is a similar caliber 7B72. The 7B62 and 7B72 share the same manual, however, it is unclear what the differences are. If you know more about this, please discuss it in the comments below…
Additional Resources:
network of watch sites
Recent Comments
hello, does anyone know if it is 1:1 clone of the 6498/6497 in terms of…
Glad you think so. Thank you for the comment!
Informative. Thank you!
Mixed experience with this caliber, I have 2 watches with it, the first one is…
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Also in the Ollech & Wajs M52
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